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EG4

EG4 314Ah Indoor Battery + FlexBOSS18 | 16kWh ESS

SKU K0216
$7,045.00
$7,045.00
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Estimated shipping time

You can typically expect your items to arrive within 4–7 business days, depending on your location and product availability.

What is your Return Policy?

At Northgrid Supply, we want every customer to shop with confidence. If something doesn’t go as planned, we’ve made returns and refunds simple and fair. Here’s how it works:

1. Return Window

You can request a return within 30 days of receiving your order. Unfortunately, we’re unable to accept returns after that time frame.

2. Who Pays for Return Shipping?

  • If your item arrives damaged, defective, or incorrect, we’ll cover the return shipping cost.
  • If you’re returning an item because you changed your mind, you’ll be responsible for return shipping fees.

3. Damaged or Defective Items

Received something broken or not working properly? Contact us within 30 days. We’ll provide a prepaid return label and once the item is returned and inspected, we’ll issue either a full refund or a replacement—including any original shipping costs.

4. Changed Your Mind?

If you no longer want the item, you can return it within 30 days—as long as it's unused, in its original packaging, and in resellable condition. You’ll need to handle the return shipping, and once we receive and inspect it, we’ll refund the product cost (excluding shipping).

5. Refund Processing

Once we receive and approve your return, we’ll send a confirmation email and issue a refund to your original payment method within 7 business days. Please allow additional time for banks or credit card companies to process and reflect the refund.

If it’s been over 10 business days since your refund was approved and you still don’t see it, contact us at support@northgridsupply.com and we’ll look into it immediately.

6. Restocking Fees

In some cases, a restocking fee may apply depending on the item and return reason. If applicable, we’ll clearly communicate this during your return request process.

The EG4 WallMount Indoor Battery ESS, paired with the FlexBOSS18 inverter, is a high-capacity indoor energy storage system designed for residential backup, solar storage, and hybrid power setups. It combines a 48V lithium battery with a hybrid inverter to deliver dependable and consistent energy for whole-home use. With approximately 16kWh of storage and a 314Ah capacity, the system supports daily energy demands and critical backup during outages. Its compact, wall-mounted design is optimized for efficient indoor installation while maintaining a space-saving profile. Built using LiFePO4 technology, this system is a leader in quality and reliability for both on-grid and off-grid solar installations.

Key Features

  • Massive Energy Storage: 16.0 kWh capacity with a 314Ah rating.

  • Reliable Chemistry: 51.2V LiFePO4 battery chemistry ensures long-term safety and thermal stability.

  • High Power Output: 200A continuous output with a peak power reach of approximately 12.8kW.

  • Indoor Optimized: IP20-rated enclosure suitable for wall-mounted or floor-mounted indoor setup.

  • Advanced Management: Features a third-generation BMS with enhanced circuit protection.

  • Climate Control: Integrated self-heating function ensures stable operation in colder environments.

  • Simplified Setup: Auto-identification feature allows for easy configuration and parallel expansion.

  • Flexible Integration: Fully compatible with FlexBOSS18 and FlexBOSS21 hybrid inverters.

  • Versatile Application: Designed for comprehensive grid-tied, hybrid, and backup applications.

  • Scalable Architecture: Modular design allows multiple batteries to be added as energy needs increase.

Performance and Efficiency

  • Extreme Longevity: The system supports up to 10,000 cycles at 80% depth of discharge for over a decade of use.

  • Stable Energy Delivery: Engineered to provide consistent and efficient power across a wide range of energy demands.

  • Smart Communication: Utilizes CAN and RS485 protocols for seamless integration with leading inverter systems.

Battery Downloads

Inverter Downloads

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    Frequently Asked Questions

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      If your order arrives defective or fails to

      function properly, you will receive a full 100% refund!

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    Frequently Bought Together

    Total price$15,354.97